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From 13a1b2e927893cbb046a1ec5a55ec3516873a3f6 Mon Sep 17 00:00:00 2001
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From: Chunfeng Yun <chunfeng.yun@mediatek.com>
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Date: Fri, 13 Oct 2017 16:26:36 +0800
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Subject: [PATCH 129/224] usb: xhci-mtk: support option to disable usb3 ports
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Add support to disable specific usb3 ports, it's useful when
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usb3 phy is shared with PCIe or SATA, because we should disable
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the corresponding usb3 port if the phy is used by PCIe or SATA.
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Sometimes it's helpful to analyse and solve problems.
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Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
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Acked-by: Mathias Nyman <mathias.nyman@linux.intel.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/usb/host/xhci-mtk.c | 18 +++++++++++++++---
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drivers/usb/host/xhci-mtk.h | 1 +
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2 files changed, 16 insertions(+), 3 deletions(-)
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--- a/drivers/usb/host/xhci-mtk.c
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+++ b/drivers/usb/host/xhci-mtk.c
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@@ -92,6 +92,7 @@ static int xhci_mtk_host_enable(struct x
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{
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struct mu3c_ippc_regs __iomem *ippc = mtk->ippc_regs;
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u32 value, check_val;
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+ int u3_ports_disabed = 0;
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int ret;
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int i;
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@@ -103,8 +104,13 @@ static int xhci_mtk_host_enable(struct x
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value &= ~CTRL1_IP_HOST_PDN;
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writel(value, &ippc->ip_pw_ctr1);
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- /* power on and enable all u3 ports */
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+ /* power on and enable u3 ports except skipped ones */
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for (i = 0; i < mtk->num_u3_ports; i++) {
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+ if ((0x1 << i) & mtk->u3p_dis_msk) {
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+ u3_ports_disabed++;
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+ continue;
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+ }
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+
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value = readl(&ippc->u3_ctrl_p[i]);
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value &= ~(CTRL_U3_PORT_PDN | CTRL_U3_PORT_DIS);
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value |= CTRL_U3_PORT_HOST_SEL;
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@@ -126,7 +132,7 @@ static int xhci_mtk_host_enable(struct x
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check_val = STS1_SYSPLL_STABLE | STS1_REF_RST |
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STS1_SYS125_RST | STS1_XHCI_RST;
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- if (mtk->num_u3_ports)
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+ if (mtk->num_u3_ports > u3_ports_disabed)
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check_val |= STS1_U3_MAC_RST;
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ret = readl_poll_timeout(&ippc->ip_pw_sts1, value,
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@@ -149,8 +155,11 @@ static int xhci_mtk_host_disable(struct
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if (!mtk->has_ippc)
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return 0;
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- /* power down all u3 ports */
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+ /* power down u3 ports except skipped ones */
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for (i = 0; i < mtk->num_u3_ports; i++) {
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+ if ((0x1 << i) & mtk->u3p_dis_msk)
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+ continue;
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+
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value = readl(&ippc->u3_ctrl_p[i]);
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value |= CTRL_U3_PORT_PDN;
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writel(value, &ippc->u3_ctrl_p[i]);
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@@ -573,6 +582,9 @@ static int xhci_mtk_probe(struct platfor
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}
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mtk->lpm_support = of_property_read_bool(node, "usb3-lpm-capable");
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+ /* optional property, ignore the error if it does not exist */
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+ of_property_read_u32(node, "mediatek,u3p-dis-msk",
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+ &mtk->u3p_dis_msk);
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ret = usb_wakeup_of_property_parse(mtk, node);
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if (ret)
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--- a/drivers/usb/host/xhci-mtk.h
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+++ b/drivers/usb/host/xhci-mtk.h
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@@ -121,6 +121,7 @@ struct xhci_hcd_mtk {
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bool has_ippc;
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int num_u2_ports;
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int num_u3_ports;
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+ int u3p_dis_msk;
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struct regulator *vusb33;
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struct regulator *vbus;
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struct clk *sys_clk; /* sys and mac clock */
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